It seems to be common to cover walls, or large parts of them, in relatively thin absorption (9 to 15mm thick). This may be because it is heavily advertised, seems to be lower cost or because it means less paintwork needs to be done. More than likely though, it is done out of ignorance. The thought that more is better is a fallacy.
Read MoreRT60 is a single figure that may be OK to describe the required performance of an office or a worshop, but it is not sufficient to describe the acoustic performance of a specialised room. Such rooms include classrooms, multi purpose halls, auditoriums, music teaching rooms etc.
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